Well the speed of light through a vacuum is seen as the speed limit of the universe but this is through normal linear space if you can bend space around you as you travel through it you would theoretically travel faster than light without breaking any of Einstein's laws.
Or so the theory goes.
Well, Einstein's laws, as you put it, already have been proven wrong--at least partially. Einstein never factored quantum mechanics into his calculations--because he didn't believe that quantum mechanics were correct.
These days, Membrane Theory has married both Einstein's laws of relativity with quantum physics. When these two work together, things like black holes, white holes, and even the big bang can be explained.